Feat; Create new table for collector configuration

[Jamesbarford]

• Adds UUID extension for postgres
• Creates a table for collector configuration; storing the target, whether the collector is active and able to take work. Has a heartbeat column so we can see if the collector goes offline. benchmark_set is for when we start splitting work between collectors

[Kobzol]

We will have probably max. 4? collectors in the near future 😅 So I think that UUIDs are overkill. My experience with messing with Postgres extensions is that it can go wrong, I would prefer to avoid this and just use good ol' autoincremented IDs.

On the other hand, I'd like to assign human-readable names to the collectors, for easier debugging. So please add a name TEXT NOT NULL column, thanks.

[Jamesbarford]

69971ef

[Kobzol]

Thanks! I think that the table looks good like it is, but also I don't think we necessarily need to merge this outright.

So I'd keep this lying here until we have some actual code (probably first in the website) that actually needs to use this table, and then write the corresponding DbPool queries so that we have a user of the table. Maybe we'll figure out that we need some additional columns by then or something.